Now, she's penned the foreward to Borges' new book based on the same principles, The 22-Day Revolution, which is touted as a "plant-based program that will transform your body, reset your habits, and change your life."

Queen Bey says the birth of her daughter, Blue Ivy, inspired the lifestyle overhaul she undertook with husband Jay Z.

"I didn’t want to do a crash diet. I was a mum now. I needed to change my ways and set an example for my child. So I turned to no one other than my good friend and fitness and nutrition confidant, Marco Borges."

But that's not to say it wasn't a challenge – even for Queen Bey. It took the pop diva close to a year to commit to the switch.

"My husband and I decided we wanted to try a completely plant-based diet with Marco," she writes. "And so the journey began that helped me get into the best shape of my life."

That's a big statement coming from the woman famous for being 'Bootylicious', but a 'day in the life' of the 22-day plan isn't so unattainable:

ninemsn Coach chatted to nutritionist Rosie Mansfield about what it takes to lunch like Beyonce, and whether or not 22 days is long enough to significantly impact your health for the better.

"Absolutely, it's long enough," she told ninemsn Coach.

"Red meat is especially harsh on the digestive system, so if you switch from consuming it regularly, a plant-based diet can be particularly beneficial."

Mansfield says the main thing to be mindful of is combining the right plants to replace the vitamins and nutrients lost by cutting out meat and certain fats, and the switch means you'll need to be actively supplementing your diet with protein powder, spirulina, zinc, iron, and vitamin B12.

"We do see quite significant weight loss in a short space of time in those we switch to a plant-based diet."

But she's quick to note that a vegan lifestyle simply isn't suitable for everyone on a biological level.

"For instance, your blood type can significantly affect how your body responds to a plant-based diet. Some bodies simply need animal proteins to function optimally," she says.
She also notes that some people may experience increased hunger because of the elimination of certain fats responsible for sating hunger.

Please note: The original version of this article originally stated that red meat is especially harsh on the immune system, not the digestive system. It has been updated to reflect the correct quote from nutritionist Rosie Mansfield.